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Finding the Fourth Proportional to 1,139.92, 1,706.28 and 831.76

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Solution

The fourth proportional to 1,139.92, 1,706.28 and 831.76 is: 1,245.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.92 : 1,706.28 = 831.76 : x
  2. Step 2: Convert to fraction form
    1,139.92/1,706.28 = 831.76/x
  3. Step 3: Cross multiply
    1,139.92x = 1,706.28 × 831.76
  4. Step 4: Simplify right side
    1,139.92x = 1,419,215.45
  5. Step 5: Solve for x
    x = 1,419,215.45/1,139.92
  6. Step 6: Final answer
    x = 1,245.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.